Plunger type pen



March 28, 1933. G. L. BAssETT PLUNGER' TYPE PEN origial Filed April 2o, 1951 MYL ATTORNEYS Patented Mar. 28, 1933 UNITED STATES PAT COMPANY, or

PLUNGER 'rYrnfrEN Application. mea April 2o, 1931, serial No. 531,568. Renewed september 21, 1932.

This invention relates to fountain pens and more particularly to an improved construe. tion lof sackless or plunger type fountain pens.

One lof the primary objects of this invention is to provide a plunger type pen wherein the operating means for the piston or plunger comprises a plurality of telescoping parts which in the Vretracted position of the piston occupy a minimum amount of space whereup-on the capacity .of the fountain pen may be accordingly increased.

The several objects, advantages and novel details of construction of the invention will be made more apparent as this description proceeds, especially when consideredv in connection with the accompanying drawing, wherein Y Figure 1 is a longitudinal sectional elevational view of a fountain pen constructed inaccor-dance with my invention, the cap being removed; Figure 2 is an enlarged fragmentary longitudinal section of a portion of the pen barrel p showing the parts in the position they assume when the piston is fully retracted, and y Figure 3 is a transverse sectional view taken substantially on the plane indicated by line 3-3 in-Figure 2. Y Y

Referring now `more particularly to the drawings wherein like reference Acharacters indicate like parts, there is illustrated ya fountain p-en barrel 10 of a tubular construction providing a reservoir 11 in which a piston 12 is adapted to reciprocate.

The reference character 18 indicates a nibend section of the pen which is secured to the end of the barrel l0, this section carrying the usual pen point 14.

The operating mechanism for the plunger, which incidentally is shown in its fullyextended position in Figure 1, comprises a sleeve member 15 which is fixed to the barrel 1() by a. threaded connection 16, this sleeve member having a closed end portion 17 at one end thereof and a reduced end portion 18 at thefother end thereof. The reduced portion 18 is preferably kof angular cross sectional shape, usually hexagonal. v l,

Swivelly mounted in the sleeve member 15 is the main or 4primary threadedmember or operating screw 19., Forlthe purpose of` mounted in the sleeve member l5 at the closed` end 17 thereof'and` this screw member-may be operated byV means of a fixed to the end thereof.

This screw memberf19 is, as clearly illus-v trated, located `within the sleevemember 15 ENT; joFFlcE Vemanano I.. BAssETT, or romeno, onIo, Assrelvonv frol THEc'oNKLIN rim TOLEDO, omo, A coRroRA'rroN or onro knob or handle 20 and threadedly engaged therewith and.

l adapted to telescope thereonis asecondary screw member 21. This member iszalso ofy hollow construction and is -provi-ded `withr companion steep-pitch threads.

.Threadedly engaged with the secondary screw member 21 and adapted to telescope thereon is asleeve member 22 which in turn v V1s connected to the piston 12.- This sleeve` member is provided with threadlugs or proy jections 23 engagingV the threads on the threaded member 21 and in orderto prevent a disengagement of these parts the secondary` r screw member 21 carries a stop-pin'24ar- `ranged transversely ofthe secondary screw` member and adapted to engage the thread .plugs 23, in 4one position ofthe parts, as shown in Figure 1. Y

The sleeve member 22 isladapted to telescope within but is non-rotatably connected to a guide sleeve 25 by means of a pin 26S/,ex-

tending transversely of this guide sleeve and through a pair of opposed longitudinally` extending slots 27 formed in the sleeve member 22. The sleeve member 22 telescopes `within the guide sleeve 25, the relative movement between these sleeve members 22 and 25 being governed by the length Aof the slots 27,

as will be obvious. The cross sectional shapeV of the guide sleeve 25 is the same as the cross sectional shapeof thereduced portion 18 so that the guide sleeve 25 may telescope with-A in the sleeve member 15 but is nonrotatably connected thereto. Therefore, guide sleeve `25 and sleeve 22 `may partake of longitudi nal movement within the 4barrel but are prevented from rotating as `will be apparent.

Afspring 28 is arranged` within the sleeve 22 and bears en .theonehand againstthe p in 26 and on the other hand against the element 29 forming a portion of the piston structure. y

The spring 28 normally urges the sleeve 22 toward the left as viewed in'Figure 1 so as to cause sufficient friction between theA stop.- pin 24 and the lugs 23 to prevent relative rotation between the secondary screwomember 21 and the sleeve22 which rotation would cause a telescopingmovementgof'these parts. Accordingly with the parts in the position shown in Figure 1,- the knob 20 is rotated, preferably in a clockwise direction, and this causes a rotation of the primary screw member 19 which because of its threaded engagement with the .secondary screw member 21 causes the secondary-y screw member 21 to ride up on the primary screw member 19 until the stop-pin 24 engages the free end of primary screwl member 19, this position. of

the parts being .shown in Figure 2. It is understood vthatr the friction between the stop-pin 24 and-the lugs 23 on. sleeve 22 prevents relative rotation between these parts and the sleeves 25 and 22 are prevented from rotating Vbecause of theL engagement of the reduced end 18 with thev guide sleeve 25. During this-.movement the guide sleeve 25 telescopes within sleeve member 15. When theprimary and secondary screw members 19 and 21 have completely telescoped, thesetwo parts then turn as a unit and this overcomes the friction between the pinv 24 and lugs 23 exerted by the-spring 28 so that the sleeve 22 then telescopes `onto the secondary screw member 21 until the pin- 26 Vengages the left hand end of the slots 27. This is the completely retracted position vof the piston 12 Yand the position of the partsfillustrated in Figure 2. s n Y f The forward propulsion-'of the piston is accomplished byfa counter-clockwise rotation of the knob V20- The first-movement is between the sleeve 22 and the secondary screw member v21, the secondary and primary screw members rotating as a unit to cause the sleeve member-to ride down along the secondary screw memberv to. substantially the position of these parts illustrated in Figure 1, -this movement being urged by the pressure eX- erted by the spring 28. This continues until thelugs 23 engage the -pin 24 and the pin 26 engages the right hand end of the slots 27. This prevents further rotation of the secondary screw member 21 so that the continued counter-clockwise rotation of the knob'20 causes the secondary screw member to -ride off the primaryscrew member until these parts assume the position illustrated in Figure 1.V r Y From the foregoing it will be apparent that by the complete telescoping of the several operating partsof the piston, these operating parts may be reduced so as to require aminimum amountof space' thereby providing scope of this invention and to this end reservation 1s made to make suchchanges as may come within the purview of the accompanying claims. l

WhatIclaim as my invention is:

1. In a fountain pen, a barrel presenting a tubular reservoir, a. piston reciprocable in said reservoir, a pair of telescoping interconnected screw members, and a telescoping non-rotatable connection between one of said screw members and said piston.

2. In a fountain pen,a barrel presenting a tubular reservoir, a'piston reciprocable in said reservoir, an operating handle swivelly mounted in said barrel, and three threadedly interconnected telescoping membe'rsconnecting said piston and said operatingmember whereby said piston may be reciprocated in said reservoir.upon'rotation of said operating handle.-

8. In a fountain pen, a barrel presenti-ng a tubular reservoir, a piston reciprocable in` said reservoir, a pair of interconnected telescoping screw members, a member connected to' said piston, and atelescoping non-rotatable connection betweeny said 'last mentioned member and one-of said screw mem-v bers. 1

4. In a fountain pen, a barrel presenting a tubular reservoir, a piston reciprocablein said reservoir, a pair vof interconnectedtelescoping screw members,-a member connected to said piston, and a telescoping non-rotatable connection between saidlast men- Ytioned member and one of said screw members, said connection including means normally preventing relative telescopic movementA between. said last member and the screw member connected therewith in one direction of movement of theparts.y

5. In a fountain pen, a barrel presenting a tubular reservoir, a piston reciprocable in said reservoir, apair of telescoping screw members, a sleeve member connected tothe piston, a threaded telescoping connection between said sleeve member and one of said screw members, vandrmeans lto prevent 4relative movement between said sleeve member and screw member during the relative telescoping movement` of said screw-members;

6. In a fountain pen, a barrel presentingk a tubular reservo1r,a piston reciprocable insaid reservoir, a main screw member 'rotatably mounted in said barrel, a second screw member adapted to telescope on saidy mainV screw member, asleeve member connected to said piston and threadedlyconnectedfto said second screw member for telescopic en agement therewith, said sleeve member eing non-rotatably mounted,and means for tensioning the connection between said sleeve member and second screw member.

7 In a fountain pen, a barrel presenting a tubular reservoir, a piston reciprocable in said reservoir, a screw member swivelly mounted in said barrel, a second screw member threadedly connected thereto and adapted to telescope thereon, a sleeve member connected to Vsaid piston, said sleeve member being threadedly connected to said second screw member and adapted to telescope thereon, and means for mounting said sleeve member for axial but non-rotative movement.

8. In a fountain pen, a barrel presenting a tubular reservoir, a piston reciprocable in said reservoir, a sleeve xed to said barrel, a main screw member mounted in said sleeve, a a second screw member having a threaded telescoping engagement with said main screw member, a guide sleeve having a sliding but non-rotative connection with said rst mentioned sleeve, a hollow piston rod connected to said piston and slidably but non-rotatably connected to said guide sleeve, a threaded telescopic connection between said piston rod and said second screw member, and means for tensioning said threaded connection.

9. In a fountain pen, a barrel presenting a tubular reservoir, a piston reciprocable in said reservoir, a pair of interconnected telescoping screw members, a piston rod, a threaded telescoping connection between said piston rod and one of said screw members, and a spring for tensioning said connection, for the purpose set forth.

l0. In a piston type fountain pen, a barrel presenting a reservoir, a piston reciprocable in said reservoir, a main screw member, a second screw member telescoping thereon, a sleeve member telescoping on said second screw member and threadedly engaging the same, means for swivelly mounting said screw member for rotative movement'only, means for mounting said sleeve member for axial movement only, and means for tensioning the threaded connection between said second screw member and said sleeve member, as and for the purpose set forth.

In testimony whereof I aliiX my signature.

GERALD L. BASSETT. 

